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ChemInform Abstract: Hydrodehalogenation of Halogenated Aryl Ketones under Multiphase Conditions. Part 5. Chemoselectivity Toward Aryl Alcohols over a Pt/C Catalyst.

✍ Scribed by M. SELVA; P. TUNDO; A. PEROSA

Publisher: John Wiley and Sons
Year: 2010
Weight: 32 KB
Volume: 29
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199834034

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✦ Synopsis

Hydrodehalogenation of Halogenated Aryl Ketones under Multiphase Conditions. Part 5. Chemoselectivity Toward Aryl Alcohols over a Pt/C Catalyst.

-High chemoselectivity towards aryl alcohols, e.g. (II), in the Pt-catalyzed hydrodehalogenation of halogenated aromatic ketones, e.g. (I), under multiphase conditions (isooctane/50% KOH) and in the presence of a phase-transfer catalyst (PTC) depends not only on the hydrophilicity of the latter (Bn-NEt + 3 Cl -is the best one), but in particular of the molar ratio of Pt to PTC, that requires a case-by-case optimization. -(SELVA, M.; TUNDO,

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Hydrodehalogenation of Halogenated Aryl Ketones under Multiphase Conditions. Part 6. pH Effect on the Chemoselectivity and Preliminary Mechanistic Investigation. -Chloropropiophenone (I) is used as model compound to study hydrodehalogenation reactions under multiphase conditions at varying pH. The